Camera optical lens

ABSTRACT

The present disclosure provides a camera optical lens including, from an object side to an image side in sequence: eight lenses which are, from an object side to an image side in sequence: a first lens having a positive refractive power, a second having a positive refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens having a positive refractive power, a sixth lens having a positive refractive power, a seventh lens having a negative refractive power, and an eighth lens having a positive refractive power; and the camera optical lens satisfies conditions of: 0.95≤f/TTL; 2.00≤f2/f≤5.00; and 2.50≤(R15+R16)/(R15−R16)≤15.00. The camera optical lens can achieve good optical performance while meeting the design requirements for ultra-thinness and long focal length.

TECHNICAL FIELD

The present disclosure relates to the field of optical lenses, particular, to a camera optical lens suitable for handheld devices, such as smart phones and digital cameras, and imaging devices, such as monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand for miniature camera lenses is increasing day by day, but in general the photosensitive devices of camera lenses are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor), and as the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices become smaller, plus the current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lenses with good imaging quality therefore have become mainstream in the market.

In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece, four-piece, or even five-piece or six-piece lens structure. However, with the development of technology and the increase of the diverse demands of users, and as the pixel area of photosensitive devices is becoming smaller and smaller and the requirement of the system on the imaging quality is improving constantly, the eight-piece lens structure gradually appears in lens designs. Although the typical eight-piece lens already has good optical performance, its optical power, lens spacing and lens shape remain unreasonable to some extents, resulting in that the lens structure, which, even though, has excellent optical performance, is not able to meet the design requirement for ultra-thinness and long focal length.

Thus, there is a need to provide a camera optical lens having excellent optical performance and meeting the design requirement for long focal length and ultra-thinness.

SUMMARY

To address the above issues, an object of the present disclosure is to provide a camera optical lens that meets a design requirement of ultra-thinness and long focal length while having excellent optical performance.

Technical solutions of the present disclosure are as follows. A camera optical lens is provided, including eight lenses which are, from an object side to an image side in sequence: a first lens having a positive refractive power, a second having a positive refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens having a positive refractive power, a sixth lens having a positive refractive power, a seventh lens having a negative refractive power, and an eighth lens having a positive refractive power; and the camera optical lens satisfies conditions of: 0.95≤f/TTL; 2.00≤f2/f≤5.00; and 2.50≤(R15+R16)/(R15−R16)≤15.00; where f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; R16 denotes a central curvature radius of an image-side surface of the eighth lens; and TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis.

As an improvement, the camera optical lens further satisfies a condition of: −10.00≤R13/R14≤−2.50; where R13 denotes a central curvature radius of an object-side surface of the seventh lens; and R14 denotes a central curvature radius of an image-side surface of the seventh lens.

As an improvement, the camera optical lens further satisfies conditions of: 0.30≤f1/f≤0.92; −3.01≤(R1+R2)/(R1−R2)≤−0.93; and 0.06≤d1/TTL≤0.19; where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of the object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.

As an improvement, the camera optical lens further satisfies conditions of: −7.07≤(R3+R4)/(R3−R4)≤−0.82; and 0.02≤d3/TTL≤0.07; where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.

As an improvement, the camera optical lens further satisfies conditions of: −1.71≤f3/f≤−0.54; 0.65≤(R5+R6)/(R5−R6)≤2.15; and 0.02≤d5/TTL≤0.05; where f3 denotes a focal length of the third lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.

As an improvement, the camera optical lens further satisfies conditions of: −508.35≤f4/f≤22.66; −12.16≤(R7+R8)/(R7−R8)≤40.93; and 0.03≤d7/TTL≤0.11; where f4 denotes a focal length of the fourth lens; R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.

As an improvement, the camera optical lens further satisfies following conditions: 2.98≤f5/f≤19.83; 2.02≤(R9+R10)/(R9−R10)≤18.51; and 0.03≤d9/TTL≤0.11; where f5 denotes a focal length of the fifth lens; R9 denotes a curvature radius of an object-side surface of the fifth lens; R10 denotes a curvature radius of an image-side surface of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.

As an improvement, the camera optical lens further satisfies a condition of: 5.92≤f6/f≤64.60; 4.64≤(R11+R12)/(R11−R12)≤71.83; and 0.04≤d11/TTL≤0.14; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.

As an improvement, the camera optical lens further satisfies a condition of: −1.90≤f7/f≤−0.61; 0.23≤(R13+R14)/(R13−R14)≤1.21; and 0.02≤d13/TTL≤0.07; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.

As an improvement, the camera optical lens further satisfies a condition of: 4.36≤f8/f≤99.68; and 0.04≤d15/TTL≤0.13; where f8 denotes a focal length of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens.

The present disclosure is advantageous in: the camera optical lens in the present disclosure has excellent optical performance and has characteristics of long focal length and ultra-thinness, and is especially applicable to mobile phone camera lens assemblies and WEB camera lenses composed by such camera elements as CCD and CMOS for high pixels.

BRIEF DESCRIPTION OF DRAWINGS

To illustrate the technical solutions according to the embodiments of the present disclosure or in the prior art more clearly, the accompanying drawings for describing the embodiments or the prior art are introduced briefly in the following. Apparently, the accompanying drawings in the following description are only some embodiments of the present disclosure, and persons of ordinary skill in the art can derive other drawings from the accompanying drawings without creative efforts.

FIG. 1 is a schematic diagram of a structure of a camera optical lens according to Embodiment 1 of the present disclosure.

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1 .

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1 .

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1 .

FIG. 5 is a schematic diagram of a structure of a camera optical lens according to Embodiment 2 of the present disclosure.

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5 .

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5 .

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5 .

FIG. 9 is a schematic diagram of a structure of a camera optical lens according to Embodiment 3 of the present disclosure.

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9 .

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9 .

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9 .

DETAILED DESCRIPTION OF EMBODIMENTS

The present disclosure will be further described below with reference to the drawings and embodiments.

To make the objects, technical solutions, and advantages of the present disclosure clearer, embodiments of the present disclosure are described in detail with reference to accompanying drawings in the following. A person of ordinary skill in the art can understand that, in the embodiments of the present disclosure, many technical details are provided to make readers better understand the present disclosure. However, even without these technical details and any changes and modifications based on the following embodiments, technical solutions required to be protected by the present disclosure can be implemented.

Embodiment 1

Referring to the accompanying drawing, the present disclosure provides a camera optical lens 10. FIG. 1 shows a camera optical lens 10 according to Embodiment 1 of the present disclosure. In FIG. 1 , an object side refers to the left side, an image side refers to the right side, and the camera optical lens 10 includes eight lenses which are, from the object side to the image side in sequence: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8. An optical element such as an optical filter GF can be arranged between the eighth lens L8 and an image surface S1.

In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are made of plastic material. In other embodiments, the lenses may be made of other material.

In this embodiment, the first lens L1 has a positive refractive power, the second lens L2 has a positive refractive power, the third lens L3 has a negative refractive power, the fourth lens L4 has a negative refractive power, the fifth lens L5 has a positive refractive power, the sixth lens L6 has a positive refractive power, the seventh lens L7 has a negative refractive power and the eighth lens L8 has a positive refractive power.

In this embodiment, the first lens L1 has a positive refractive power, which facilitates improving performance of the camera optical lens.

In this embodiment, a focal length of the camera optical lens 10 is defined as f, a focal length of the second lens L2 is defined as f2, a central curvature radius of the object-side surface of the eighth lens L8 is defined as R15, a central curvature radius of the image-side surface of the eighth lens L8 is defined as R16, and a total optical length from the object side surface of the first lens L1 to an image surface S1 of the camera optical lens 10 along an optical axis is defined as TTL. The camera optical lens 10 satisfies conditions of: 0.95≤f/TTL;  (1) 2.00≤f2/f≤5.00; and  (2) 2.50≤(R15+R16)/(R15−R16)≤15.00.  (3)

Condition (1) specifies a ratio of the focal length of the camera optical lens 10 and the total optical length of the camera optical lens 10. Given a same total optical length, the camera optical lens 10 has the focal length longer.

Condition (2) specifies a ratio of the focal length of the second lens L2 to the focal length of the camera optical lens 10. Within this condition, a spherical aberration and a field curvature of the camera optical lens 10 can be effectively balanced.

Condition (3) specifies a shape of the eighth lens L8. Within this condition, correction of the off-axis aberration is facilitated.

A central curvature radius of the object-side surface of the seventh lens L7 is defined as R13, and a central curvature radius of the image-side surface of the seventh lens L7 is defined as R14. The camera optical lens 10 satisfies a condition of −10.00≤R13/R14≤−2.50, which specifies a shape of the seventh lens L7. Within this condition, the deflection degree of the light passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, the camera optical lens 10 satisfies a condition of −9.67≤R13/R14≤−2.61.

In this embodiment, the first lens L1 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the first lens is defined as f1. The camera optical lens 10 satisfies a condition of 0.30≤f1/f≤0.92, which specifies a ratio of the focal length of the first lens L1 to the focal length of the camera optical lens 10. Within this condition, the first lens L1 has an appropriate positive refractive power, the correction of the aberration of the camera optical lens 10 is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.48≤f1/f≤0.74.

A central curvature radius of an object-side surface of the first lens L1 is defined as R1, and a central curvature radius of an image-side surface of the first lens L1 is defined as R2. The camera optical lens 10 satisfies a condition of −3.01≤(R1+R2)/(R1−R2)≤−0.93. This can reasonably control a shape of the first lens L1 in such a manner that the first lens L1 can effectively correct a spherical aberration of the camera optical lens 10. Preferably, the camera optical lens 10 satisfies a condition of −1.88≤(R1+R2)/(R1−R2)≤−1.17.

An on-axis thickness of the first lens L1 is defined as d1, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.06≤d1/TTL≤0.19. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.10≤d1/TTL≤0.15.

In this embodiment, the second lens L2 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

A central curvature radius of the object-side surface of the second lens L2 is defined as R3, and a central curvature radius of the image-side surface of the second lens L2 is defined as R4. The camera optical lens 10 satisfies a condition of −7.07≤(R3+R4)/(R3−R4)≤−0.82, which specifies a shape of the second lens L2. Within this condition, correction of the on-axis chromatic aberration is facilitated. Preferably, the camera optical lens 10 satisfies a condition of −4.42≤(R3+R4)/(R3−R4)≤−1.02.

An on-axis thickness of the second lens L2 is defines as d3, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.02≤d3/TTL≤0.07. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.04≤d3/TTL≤0.05.

In this embodiment, the third lens L3 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

A focal length of the third lens L3 is defined as f3, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies a condition of −1.71≤f3/f≤−0.54. With reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of −1.07≤f3/f≤−0.67.

A central curvature radius of the object-side surface of the third lens L3 is defined as R5, and a central curvature radius of the image-side surface of the third lens L3 is defined as R6. The camera optical lens 10 satisfies a condition of 0.65≤(R5+R6)/(R5−R6)≤2.15, which specifies a shape of the third lens L3. Within this condition, the deflection degree of the light passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, the camera optical lens 10 satisfies a condition of 1.03≤(R5+R6)/(R5−R6)≤1.72.

An on-axis thickness of the third lens L3 is defined as d5, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.02≤d5/TTL≤0.05. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.03≤d5/TTL≤0.04.

In this embodiment, the fourth lens L4 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

A focal length of the fourth lens L4 is defined as f4, and the focal length of the camera optical lens 10 is defined as f, and. The camera optical lens 10 satisfies a condition of −508.35≤f4/f≤22.66, which specifies a ratio of the focal length of the fourth lens L4 and the focal length of the camera optical lens 10. Within this condition, improvement of performance of the camera optical lens 10 is facilitated. Preferably, the camera optical lens 10 satisfies a condition of −317.72≤f4/f≤18.13.

A central curvature radius of the object-side surface of the fourth lens L4 is defined as R7, and a central curvature radius of the image-side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 satisfies a condition of −12.16≤(R7+R8)/(R7−R8)≤40.93, which specifies a shape of the fourth lens L4. Within this condition, correction of the off-axis aberration is facilitated. Preferably, the camera optical lens 10 satisfies a condition of −7.60≤(R7+R8)/(R7−R8)≤32.75.

An on-axis thickness of the fourth lens L4 is defined as d7, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.03≤d7/TTL≤0.11. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.05≤d7/TTL≤0.09.

In this embodiment, the fifth lens L5 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

A focal length of the fifth lens L5 is defined as f5, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies a condition of 2.98≤f5/f≤19.83, which specifies the fifth lens L5 so as to enable the light angle of the camera optical lens 10 to be gradual and reduce the tolerance sensitivity. Preferably, the camera optical lens 10 satisfies a condition of 4.76≤f5/f≤15.86.

A central curvature radius of the object-side surface of the fifth lens L5 is defined as R9, and a central curvature radius of the image-side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 satisfies a condition of 2.02≤(R9+R10)/(R9−R10)≤18.51, which specifies a shape of the fifth lens L5. Within this condition, correction of the off-axis aberration is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 3.23≤(R9+R10)/(R9−R10)≤14.81.

An on-axis thickness of the fifth lens L5 is defined as d9, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.03≤d9/TTL≤0.11. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.04≤d9/TTL≤0.09.

In this embodiment, the sixth lens L6 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the sixth lens L6 is defined as f6. The camera optical lens 10 satisfies a condition of 5.92≤f6/f≤64.60. With reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of 9.47≤f6/f≤51.68.

A central curvature radius of an object-side surface of the sixth lens L6 is defined as R11, and a central curvature radius of an image-side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 satisfies a condition of 4.64≤(R11+R12)/(R11−R12)≤71.83, which specifies a shape of the sixth lens L6. Within this condition, correction of the off-axis aberration is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 7.42≤(R11+R12)/(R11−R12)≤57.46.

An on-axis thickness of the sixth lens L6 is defined as d11, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.04≤d11/TTL≤0.14. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.06≤d11/TTL≤0.11.

In this embodiment, the seventh lens L7 includes an object-side surface being concave in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the seventh lens L7 is defined as f7. The camera optical lens 10 satisfies a condition of −1.90≤f7/f≤−0.61. With reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of −1.19≤f7/f≤−0.76.

A central curvature radius of the object-side surface of the seventh lens L7 is defined as R13, and a central curvature radius of the image-side surface of the seventh lens L7 is defined as R14. The camera optical lens 10 satisfies a condition of 0.23≤(R13+R14)/(R13−R14)≤1.21, which specifies a shape of the seventh lens L7. Within this condition, correction of the off-axis aberration is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.37≤(R13+R14)/(R13−R14)≤0.97.

An on-axis thickness of the seventh lens L7 is defined as d13, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.02≤d13/TTL≤0.07. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.03≤d13/TTL≤0.06.

In this embodiment, the eighth lens L8 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the eighth lens L8 is defined as f8. The camera optical lens 10 satisfies a condition of 4.36≤f8/f≤99.68. With reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of 6.97≤f8/f≤79.75.

An on-axis thickness of the eighth lens L8 is defined as d15, the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.04≤d15/TTL≤0.13. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.07≤d15/TTL≤0.10.

It should be appreciated that, in other embodiments, configuration of the object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have a distribution in convex and concave other than that of the above-discussed embodiment.

In this embodiment, the focal length of the camera optical lens 10 is defined as f, and a combined focal length of the first lens L1 and of the second lens L2 is defined as f12. The camera optical lens 10 satisfies a condition of 0.24≤f12/f≤0.81. Within this condition, the aberration and distortion of the camera optical lens 10 can be eliminated and a back focal length of the camera optical lens is reduced, thereby maintaining miniaturization of the camera optical lens. Preferably, the camera optical lens 10 satisfies a condition of 0.39≤f12/f≤0.64.

In this embodiment, the total optical length of the camera optical lens 10 is defined as TTL, an image height of the camera optical lens 10 is defined as IH. The camera optical lens 10 satisfies a condition of TTL/IH≤2.43, which facilitates ultra-thinness of the lenses.

In this embodiment, the focal length of the camera optical lens 10 is defined as f, the image height of the camera optical lens 10 is defined as IH. The camera optical lens 10 satisfies a condition of f/IH≥2.42, which enables the camera optical lens 10 to achieve long focal length.

When the focal length of the camera optical lens 10 as well as the focal length and the central curvature radius of each lens satisfy the above relationships, the camera optical lens 10 meets the design requirements of ultra-thinness and long focal length while having excellent optical imaging performance. Based on the characteristics of the camera optical lens 10, the camera optical lens 10 is particularly applicable to mobile camera lens assemblies and WEB camera lenses composed of such camera elements as CCD and CMOS for high pixels.

The camera optical lens 10 will be further described with reference to the following examples. Symbols used in various examples are shown as follows. The focal length, on-axis distance, central curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Total optical length (the distance from the object side surface of the first lens L1 to the image surface Si of the camera optical lens along the optical axis) in mm.

FNO: ratio of an effective focal length and an entrance pupil diameter of the camera optical lens.

In addition, inflexion points and/or arrest points can be arranged on at least one of the object-side surface and/or the image-side surface of the lenses, so as to satisfy the demand for high quality imaging. The description below can be referred for specific implementations.

The design data of the camera optical lens 10 in Embodiment 1 of the present disclosure are shown in Table 1 and Table 2.

TABLE 1 R d nd νd S1 ∞ d0= −0.546 R1 1.691 d1= 0.748 nd1 1.5444 ν1 55.82 R2 8.397 d2= 0.057 R3 5.974 d3= 0.270 nd2 1.5444 ν2 55.82 R4 58.300 d4= 0.094 R5 21.605 d5= 0.220 nd3 1.6400 ν3 23.54 R6 2.750 d6= 0.405 R7 61.739 d7= 0.452 nd4 1.5444 ν4 55.82 R8 57.374 d8= 0.435 R9 −10.157 d9= 0.433 nd5 1.6400 ν5 23.54 R10 −8.634 d10= 0.056 R11 −10.779 d11= 0.559 nd6 1.6400 ν6 23.54 R12 −10.338 d12= 0.722 R13 −11.337 d13= 0.278 nd7 1.5444 ν7 55.82 R14 4.174 d14= 0.177 R15 −45.731 d15= 0.519 nd8 1.6400 ν8 23.54 R16 −19.636 d16= 0.180 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.248

In the table, meanings of various symbols will be described as follows.

-   -   S1: aperture;     -   R: central curvature radius of an optical surface;     -   R1: central curvature radius of the object-side surface of the         first lens L1;     -   R2: central curvature radius of the image-side surface of the         first lens L1;     -   R3: central curvature radius of the object-side surface of the         second lens L2;     -   R4: central curvature radius of the image-side surface of the         second lens L2;     -   R5: central curvature radius of the object-side surface of the         third lens L3;     -   R6: central curvature radius of the image-side surface of the         third lens L3;     -   R7: central curvature radius of the object-side surface of the         fourth lens L4;     -   R8: central curvature radius of the image-side surface of the         fourth lens L4;     -   R9: central curvature radius of the object-side surface of the         fifth lens L5;     -   R10: central curvature radius of the image-side surface of the         fifth lens L5;     -   R11: central curvature radius of the object-side surface of the         sixth lens L6;     -   R12: central curvature radius of the image-side surface of the         sixth lens L6;     -   R13: central curvature radius of the object-side surface of the         seventh lens L7;     -   R14: central curvature radius of the image-side surface of the         seventh lens L7;     -   R15: central curvature radius of an object-side surface of the         eighth lens L8;     -   R16: central curvature radius of an image-side surface of the         eighth lens L8;     -   R17: central curvature radius of an object-side surface of the         optical filter GF;     -   R18: central curvature radius of an image-side surface of the         optical filter GF;     -   d: on-axis thickness of a lens and an on-axis distance between         lenses;     -   d0: on-axis distance from the aperture S1 to the object-side         surface of the first lens L1;     -   d1: on-axis thickness of the first lens L1;     -   d2: on-axis distance from the image-side surface of the first         lens L1 to the object-side surface of the second lens L2;     -   d3: on-axis thickness of the second lens L2;     -   d4: on-axis distance from the image-side surface of the second         lens L2 to the object-side surface of the third lens L3;     -   d5: on-axis thickness of the third lens L3;     -   d6: on-axis distance from the image-side surface of the third         lens L3 to the object-side surface of the fourth lens L4;     -   d7: on-axis thickness of the fourth lens L4;     -   d8: on-axis distance from the image-side surface of the fourth         lens L4 to the object-side surface of the fifth lens L5;     -   d9: on-axis thickness of the fifth lens L5;     -   d10: on-axis distance from the image-side surface of the fifth         lens L5 to the object-side surface of the sixth lens L6;     -   d11: on-axis thickness of the sixth lens L6;     -   d12: on-axis distance from the image-side surface of the sixth         lens L6 to the object-side surface of the seventh lens L7;     -   d13: on-axis thickness of the seventh lens L7;     -   d14: on-axis distance from the image-side surface of the seventh         lens L7 to the object-side surface of the eighth lens L8;     -   d15: on-axis thickness of the eighth lens L8;     -   d16: on-axis distance from the image-side surface of the eighth         lens L8 to the object-side surface of the optical filter GF;     -   d17: on-axis thickness of the optical filter GF;     -   d18: on-axis distance from the image-side surface of the optical         filter GF to the image surface Si;     -   nd: refractive index of the d line;     -   nd1: refractive index of the d line of the first lens L1;     -   nd2: refractive index of the d line of the second lens L2;     -   nd3: refractive index of the d line of the third lens L3;     -   nd4: refractive index of the d line of the fourth lens L4;     -   nd5: refractive index of the d line of the fifth lens L5;     -   nd6: refractive index of the d line of the sixth lens L6;     -   nd7: refractive index of the d line of the seventh lens L7;     -   nd8: refractive index of the d line of the eighth lens L8;     -   ndg: refractive index of the d line of the optical filter GF;     -   vd: abbe number;     -   v1: abbe number of the first lens L1;     -   v2: abbe number of the second lens L2;     -   v3: abbe number of the third lens L3;     -   v4: abbe number of the fourth lens L4;     -   v5: abbe number of the fifth lens L5;     -   v6: abbe number of the sixth lens L6;     -   v7: abbe number of the seventh lens L7;     -   v8: abbe number of the eighth lens L8;     -   vg: abbe number of the optical filter GF.

Table 2 shows aspheric surface data of the camera optical lens 10 in Embodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −1.1169E−01  4.8226E−03 −3.0912E−03  1.0965E−02 −1.0868E−02 5.1942E−03 R2 −1.2768E+01 −8.5451E−03 −4.4841E−03  −3.1062E−04   2.3393E−04 1.7073E−04 R3 −1.4479E+01 −8.2092E−03 −5.5330E−03  −3.1216E−03   8.6455E−04 1.9252E−03 R4 −6.0151E+02 −2.5639E−02 9.7559E−03 2.0877E−01 −3.4405E−01 2.2859E−01 R5 −3.9444E+02 −1.0291E−01 2.0142E−01 1.4277E−01 −5.5132E−01 4.7806E−01 R6 −1.9031E+00 −6.8235E−02 2.9065E−01 −8.1224E−02  −1.1961E−01 9.5952E−02 R7  9.3878E+02 −2.2758E−02 8.3304E−02 1.3326E−01 −2.2962E−01 1.5065E−01 R8  1.0000E+03 −2.9460E−02 6.4232E−02 6.1753E−02 −1.3578E−01 8.8436E−02 R9 −3.7079E+01 −5.4125E−02 8.1926E−03 −1.7504E−02  −2.6188E−03 −1.9875E−03  R10  2.3464E+01 −5.6336E−03 −1.7563E−02  −5.0879E−04  −2.4103E−03 4.4018E−04 R11  5.5564E+01 −2.7049E−02 3.6312E−03 7.6134E−05  2.5796E−03 7.3076E−04 R12  3.2293E+01 −4.1517E−02 1.0618E−02 3.9763E−03 −5.0758E−04 −5.3860E−05  R13 −2.2493E+02 −1.7030E−01 −2.2553E−02  7.5458E−02 −3.5009E−02 3.1339E−03 R14  9.7396E−01 −1.7574E−01 3.1976E−02 3.2117E−02 −2.7315E−02 8.8456E−03 R15 −9.9933E+02 −9.9526E−02 9.5896E−02 −4.9290E−02   1.3961E−02 −2.3275E−03  R16  2.4601E+01 −8.4212E−02 6.9707E−02 −3.1769E−02   8.0530E−03 −1.1753E−03  Conic coefficient Aspheric surface coefficients k A14 A16 R1 −1.1169E−01 4.8237E−05 −5.6015E−04 R2 −1.2768E+01 1.0309E−04  6.7331E−05 R3 −1.4479E+01 1.2328E−03  2.7231E−04 R4 −6.0151E+02 −6.2344E−02   8.2195E−03 R5 −3.9444E+02 −1.6595E−01   1.7445E−02 R6 −1.9031E+00 2.2253E−03 −1.4617E−02 R7  9.3878E+02 −4.2952E−02   1.7817E−03 R8  1.0000E+03 −1.7403E−02  −5.1795E−03 R9 −3.7079E+01 −4.0823E−03   2.3469E−03 R10  2.3464E+01 9.1435E−04  2.7066E−04 R11  5.5564E+01 1.1989E−04 −2.7209E−04 R12  3.2293E+01 −1.1515E−05  −2.3495E−05 R13 −2.2493E+02 1.5903E−03 −3.0334E−04 R14  9.7396E−01 −1.3812E−03   8.7949E−05 R15 −9.9933E+02 2.2447E−04 −9.7393E−06 R16  2.4601E+01 9.1261E−05 −2.7140E−06

In table 2, K is a conic coefficient, and A4, A6, A8, A10, A12, A14 and A16 are aspheric surface coefficients. y=(x ² /R)/{1+[1−(k+1)(x ² /R ²)]^(1/2) }+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶  (4)

Herein, x denotes a vertical distance between a point in the aspheric curve and the optical axis, and y denotes an aspheric depth (i.e. a vertical distance between the point having a distance of x from the optical axis and a plane tangent to the vertex on the optical axis of the aspheric surface).

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above formula (1). However, the present disclosure is not limited to the aspherical polynomials form shown in the formula (1).

Table 3 and Table 4 show design data of inflexion points and arrest points of each lens of the camera optical lens 10 according to Embodiment 1 of the present disclosure. P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, and P8R1 and P8R2 represent the object-side surface and the image-side surface of the eighth lens L8. The data in the column named “inflexion point position” refers to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refers to vertical distances from arrest points arranged on each lens surface to the optical axis of the camera optical lens 10.

TABLE 3 Number(s) of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 0 / / P1R2 2 0.765 1.135 P2R1 0 / / P2R2 2 0.275 0.375 P3R1 2 0.225 0.405 P3R2 0 / / P4R1 0 / / P4R2 1 1.015 / P5R1 0 / / P5R2 1 1.195 / P6R1 2 1.105 1.275 P6R2 2 1.175 1.375 P7R1 1 1.565 / P7R2 2 0.355 1.875 P8R1 1 1.885 / P8R2 1 2.115 /

TABLE 4 Number(s) of Arrest point arrest points position 1 P1R1 0 / P1R2 0 / P2R1 0 / P2R2 0 / P3R1 0 / P3R2 0 / P4R1 0 / P4R2 0 / P5R1 0 / P5R2 0 / P6R1 0 / P6R2 0 / P7R1 0 / P7R2 1 0.645 P8R1 0 / P8R2 0 /

In the subsequent Table 13, various parameters of Embodiments 1, 2 and 3 and values corresponding to the parameters specified in the above conditions are shown.

As shown in Table 13, Embodiment 1 satisfies the various conditions.

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 10 in Embodiment 1, respectively. FIG. 4 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 10 in Embodiment 1. A field curvature S in FIG. 4 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

In this Embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 10 is 2.526 mm, an image height (IH) of 1.0 H is 2.500 mm, and a field of view (FOV) in a diagonal direction is 44.30°. Thus, the camera optical lens 10 achieves ultra-thinness and long focal length, the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 2

Embodiment 2, which provides a camera optical lens 20 structurally shown in FIG. 5 , is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

In this embodiment, the fourth lens L4 has a positive refractive power.

Table 5 and Table 6 show design data of a camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5 R d nd νd S1 ∞ d0= −0.553 R1 1.687 d1= 0.755 nd1 1.5444 ν1 55.82 R2 9.220 d2= 0.053 R3 6.769 d3= 0.270 nd2 1.5444 ν2 55.82 R4 15.600 d4= 0.091 R5 15.376 d5= 0.220 nd3 1.6400 ν3 23.54 R6 2.732 d6= 0.419 R7 15.526 d7= 0.414 nd4 1.5444 ν4 55.82 R8 22.286 d8= 0.534 R9 −12.889 d9= 0.382 nd5 1.6400 ν5 23.54 R10 −8.742 d10= 0.056 R11 −11.755 d11= 0.479 nd6 1.6400 ν6 23.54 R12 −9.889 d12= 0.746 R13 −19.107 d13= 0.250 nd7 1.5444 ν7 55.82 R14 3.746 d14= 0.193 R15 −31.020 d15= 0.500 nd8 1.6400 ν8 23.54 R16 −24.507 d16= 0.305 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.174

Table 6 shows aspheric surface data of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −1.0706E−01  4.8117E−03 −2.5767E−03  1.0734E−02 −1.0779E−02 5.2883E−03 R2 −5.8343E+00 −7.5977E−03 −4.5175E−03  −4.9100E−04  −2.6041E−05 6.4526E−05 R3 −1.5284E+01 −8.6599E−03 −6.3945E−03  −3.8615E−03   8.4698E−04 1.9105E−03 R4 −8.8780E+02 −3.2752E−02 1.1249E−02 2.1076E−01 −3.4456E−01 2.2821E−01 R5 −1.0000E+03 −1.0669E−01 2.0148E−01 1.4538E−01 −5.5032E−01 4.7640E−01 R6 −1.7293E+00 −6.7132E−02 2.9634E−01 −9.1009E−02  −1.2324E−01 9.9030E−02 R7 −7.8488E+01 −2.5625E−02 7.9031E−02 1.3176E−01 −2.2830E−01 1.5162E−01 R8  4.3234E−01 −3.4369E−02 5.9894E−02 6.8200E−02 −1.3524E−01 8.8231E−02 R9 −6.9707E+01 −5.1379E−02 6.9780E−03 −1.6470E−02   5.4213E−04 −2.2334E−03  R10  1.7462E+01 −3.7640E−03 −1.5487E−02  1.1938E−03 −3.5307E−03 −3.6910E−04  R11  5.7953E+01 −2.4857E−02 5.1963E−03 −2.6148E−04   2.3815E−03 5.7801E−04 R12  2.9214E+01 −4.2863E−02 8.7266E−03 3.6028E−03 −5.2634E−04 7.4783E−05 R13 −4.7996E+02 −1.6282E−01 −2.8542E−02  7.5687E−02 −3.4952E−02 3.0865E−03 R14  5.1822E−01 −1.7536E−01 3.0229E−02 3.1747E−02 −2.7239E−02 8.8658E−03 R15  1.2401E+02 −9.8218E−02 9.4986E−02 −4.9341E−02   1.3964E−02 −2.3246E−03  R16  4.3724E+01 −8.7765E−02 7.0336E−02 −3.1710E−02   8.0434E−03 −1.1787E−03  Conic coefficient Aspheric surface coefficients k A14 A16 R1 −1.0706E−01 8.6287E−05 −5.5620E−04 R2 −5.8343E+00 1.2765E−04  1.3807E−04 R3 −1.5284E+01 1.0869E−03  1.5019E−04 R4 −8.8780E+02 −6.1986E−02   7.6556E−03 R5 −1.0000E+03 −1.6754E−01   1.8777E−02 R6 −1.7293E+00 4.0850E−03 −1.4362E−02 R7 −7.8488E+01 −4.2792E−02   1.3913E−03 R8  4.3234E−01 −1.6498E−02  −5.4375E−03 R9 −6.9707E+01 −4.6769E−03   2.7969E−03 R10  1.7462E+01 7.3425E−04  5.1557E−04 R11  5.7953E+01 1.1544E−04 −1.7682E−04 R12  2.9214E+01 3.4424E−05 −3.2579E−05 R13 −4.7996E+02 1.5875E−03 −2.8709E−04 R14  5.1822E−01 −1.3796E−03   8.7449E−05 R15  1.2401E+02 2.2488E−04 −9.7197E−06 R16  4.3724E+01 9.0999E−05 −2.5920E−06

Table 7 and table 8 show design data of inflexion points and arrest points of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 7 Number(s) of Inflexion Inflexion inflexion points point position 1 point position 2 P1R1 0 / / P1R2 2 0.765 1.135 P2R1 2 0.725 0.945 P2R2 0 / / P3R1 2 0.235 0.425 P3R2 0 / / P4R1 0 / / P4R2 1 1.045 / P5R1 0 / / P5R2 1 1.205 / P6R1 2 1.045 1.425 P6R2 2 1.225 1.465 P7R1 1 1.515 / P7R2 2 0.375 1.835 P8R1 1 1.895 / P8R2 1 2.115 /

TABLE 8 Number(s) of Arrest point arrest points position 1 P1R1 0 / P1R2 0 / P2R1 0 / P2R2 0 / P3R1 0 / P3R2 0 / P4R1 0 / P4R2 0 / P5R1 0 / P5R2 0 / P6R1 1 1.345 P6R2 0 / P7R1 0 / P7R2 1 0.685 P8R1 0 / P8R2 0 /

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 20 in Embodiment 2, respectively. FIG. 8 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 20 in Embodiment 2. A field curvature S in FIG. 8 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

As shown in the subsequent Table 13, the camera optical lens 20 in Embodiment 2 satisfies the various conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 20 is 2.527 mm, an image height (IH) of 1.0 H is 2.500 mm, and a field of view (FOV) in the diagonal direction is 44.30°. Thus, the camera optical lens 20 achieves ultra-thinness and long focal length, the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 3

Embodiment 3, which provides a camera optical lens 30 structurally shown in FIG. 9 , is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

In this embodiment, the fourth lens L4 has a positive refractive power.

Table 9 and Table 10 show design data of a camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 9 R d nd νd S1 ∞ d0= −0.551 R1 1.692 d1= 0.757 nd1 1.5444 ν1 55.82 R2 10.120 d2= 0.053 R3 7.427 d3= 0.270 nd2 1.5444 ν2 55.82 R4 13.285 d4= 0.089 R5 15.791 d5= 0.220 nd3 1.6400 ν3 23.54 R6 2.730 d6= 0.403 R7 8.826 d7= 0.409 nd4 1.5444 ν4 55.82 R8 12.302 d8= 0.588 R9 −15.670 d9= 0.340 nd5 1.6400 ν5 23.54 R10 −9.454 d10= 0.056 R11 −12.086 d11= 0.462 nd6 1.6400 ν6 23.54 R12 −9.733 d12= 0.758 R13 −32.615 d13= 0.250 nd7 1.5444 ν7 55.82 R14 3.491 d14= 0.199 R15 −38.738 d15= 0.500 nd8 1.6400 ν8 23.54 R16 −33.895 d16= 0.307 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.179

Table 10 shows aspheric surface data of each lens of the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −1.0832E−01  4.6721E−03 −2.3658E−03  1.0472E−02 −1.0745E−02 5.3153E−03 R2  2.3455E+00 −6.4322E−03 −4.4569E−03  −6.0839E−04  −2.1122E−04 2.1323E−05 R3 −1.5151E+01 −8.8048E−03 −6.7679E−03  −4.0661E−03   9.5069E−04 1.8903E−03 R4 −4.7797E+02 −3.7999E−02 1.2523E−02 2.1154E−01 −3.4542E−01 2.2833E−01 R5 −9.8028E+02 −1.0743E−01 2.0128E−01 1.4788E−01 −5.4951E−01 4.7514E−01 R6 −2.0601E+00 −6.8611E−02 3.0259E−01 −9.7176E−02  −1.2388E−01 1.0264E−01 R7 −1.0090E+02 −3.0941E−02 7.6040E−02 1.3322E−01 −2.2685E−01 1.5168E−01 R8 −1.3538E+02 −4.3526E−02 5.7561E−02 7.1548E−02 −1.3594E−01 8.8121E−02 R9  3.1448E+01 −5.7386E−02 3.7154E−03 −1.4087E−02   3.1113E−03 −3.1169E−03  R10  2.3915E+01 −1.0332E−02 −1.4246E−02  2.8886E−03 −3.6339E−03 −5.6199E−04  R11  6.3557E+01 −2.3090E−02 5.6772E−03 −6.7645E−04   2.1137E−03 4.1414E−04 R12  3.2505E+01 −4.3545E−02 7.9599E−03 3.2929E−03 −8.6038E−04 9.1487E−05 R13 −4.8901E+02 −1.5748E−01 −3.2886E−02  7.5919E−02 −3.4804E−02 3.1006E−03 R14  3.5165E−02 −1.7411E−01 2.8499E−02 3.1525E−02 −2.7141E−02 8.8888E−03 R15  2.6485E+02 −9.8923E−02 9.4100E−02 −4.9359E−02   1.3962E−02 −2.3215E−03  R16  1.2104E+02 −9.0135E−02 7.0602E−02 −3.1692E−02   8.0365E−03 −1.1809E−03  Conic coefficient Aspheric surface coefficients k A14 A16 R1 −1.0832E−01 8.7824E−05 −5.4758E−04 R2  2.3455E+00 1.4967E−04  1.3038E−04 R3 −1.5151E+01 8.8455E−04  6.0809E−05 R4 −4.7797E+02 −6.1332E−02   6.7264E−03 R5 −9.8028E+02 −1.6874E−01   1.9768E−02 R6 −2.0601E+00 4.9490E−03 −1.5912E−02 R7 −1.0090E+02 −4.3050E−02   1.3062E−03 R8 −1.3538E+02 −1.5452E−02  −5.7438E−03 R9  3.1448E+01 −5.6947E−03   3.5128E−03 R10  2.3915E+01 6.4407E−04  5.3771E−04 R11  6.3557E+01 9.3030E−05 −1.1399E−04 R12  3.2505E+01 7.4878E−05 −2.3860E−05 R13 −4.8901E+02 1.5870E−03 −2.8653E−04 R14  3.5165E−02 −1.3787E−03   8.6404E−05 R15  2.6485E+02 2.2556E−04 −9.6612E−06 R16  1.2104E+02 9.0904E−05 −2.4819E−06

Table 11 and Table 12 show design data of inflexion points and arrest points of each lens in the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 11 Number(s) of Inflexion Inflexion inflexion points point position 1 point position 2 P1R1 0 / / P1R2 2 0.775 1.155 P2R1 2 0.705 0.975 P2R2 0 / / P3R1 2 0.225 0.435 P3R2 0 / / P4R1 0 / / P4R2 1 1.055 / P5R1 0 / / P5R2 1 1.205 / P6R1 2 1.065 1.425 P6R2 2 1.375 1.455 P7R1 1 1.515 / P7R2 2 0.395 1.815 P8R1 1 1.875 / P8R2 1 2.095 /

TABLE 12 Number(s) of Arrest point arrest points position 1 P1R1 0 / P1R2 0 / P2R1 0 / P2R2 0 / P3R1 0 / P3R2 0 / P4R1 0 / P4R2 0 / P5R1 0 / P5R2 0 / P6R1 1 1.375 P6R2 0 / P7R1 0 / P7R2 1 0.715 P8R1 0 / P8R2 0 /

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 30 in Embodiment 3, respectively. FIG. 12 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 30 in Embodiment 3. A field curvature S in FIG. 12 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

As shown in the subsequent Table 13, the camera optical lens 30 in Embodiment 3 satisfies the various conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 30 is 2.527 mm, an image height (IH) of 1.0 H is 2.500 mm, and a field of view (FOV) in the diagonal direction is 44.32°. Thus, the camera optical lens 30 achieves ultra-thinness and long focal length, the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

TABLE 13 Parameters Embodiment Embodiment Embodiment and conditions 1 2 3 f/TTL 1.00 1.00 1.00 f2/f 2.01 3.57 5.00 (R15 + R16)/(R15 − R16) 2.51 8.53 15.00 f  6.062 6.064 6.065 f1  3.725 3.648 3.603 f2  12.152 21.636 30.312 f3  −4.897 −5.175 −5.139 f4  −1540.820 91.627 54.856 f5  80.123 40.559 36.095 f6  261.090 87.520 71.825 f7  −5.545 −5.707 −5.753 f8  52.822 175.290 403.058 f12 2.967 3.184 3.259 FNO 2.40 2.40 2.40 TTL 6.063 6.051 6.050 FOV 44.30° 44.30° 44.32° IH 2.500 2.500 2.500

The above-described are merely embodiments of the present disclosure. It should be noted that those of ordinary skill in the art can make improvements without departing from the inventive concept of the present disclosure, such improvements, however, fall within the protection scope of the present disclosure. 

What is claimed is:
 1. A camera optical lens comprising eight lenses which are, from an object side to an image side in sequence: a first lens having a positive refractive power, a second having a positive refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens having a positive refractive power, a sixth lens having a positive refractive power, a seventh lens having a negative refractive power, and an eighth lens having a positive refractive power; wherein the camera optical lens satisfies the conditions of: 0.95≤f/TTL; 2.00≤f2/f≤5.00; and 2.50≤(R15+R16)/(R15−R16)≤15.00; where f denoted a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; R16 denotes a central curvature radius of an image-side surface of the eighth lens; and TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis.
 2. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies a condition of: −10.00≤R13/R14≤−2.50; where R13 denotes a central curvature radius of an object-side surface of the seventh lens; and R14 denotes a central curvature radius of an image-side surface of the seventh lens.
 3. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the conditions of: 0.30≤f1/f≤0.92; −3.01≤(R1+R2)/(R1−R2)≤−0.93; and 0.06≤d1/TTL≤0.19; where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of the object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.
 4. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the conditions of: −7.07≤(R3+R4)/(R3−R4)≤−0.82; and 0.02≤d3/TTL≤0.07; where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.
 5. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the conditions of: −1.71≤f3/f≤−0.54; 0.65≤(R5+R6)/(R5−R6)≤2.15; and 0.02≤d5/TTL≤0.05; where f3 denotes a focal length of the third lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.
 6. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the conditions of: −508.35≤f4/f≤22.66; −12.16≤(R7+R8)/(R7−R8)≤40.93; and 0.03≤d7/TTL≤0.11; where f4 denotes a focal length of the fourth lens, R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.
 7. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: 2.98≤f5/f≤19.83; 2.02≤(R9+R10)/(R9−R10)≤18.51; and 0.03≤d9/TTL≤0.11; where f5 denotes a focal length of the fifth lens; R9 denotes a curvature radius of an object-side surface of the fifth lens; R10 denotes a curvature radius of an image-side surface of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.
 8. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies at least one condition of: 5.92≤f6/f≤64.60; 4.64≤(R11+R12)/(R11−R12)≤71.83; and 0.04≤d11/TTL≤0.14; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.
 9. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies at least one condition of: −1.90≤f7/f≤−0.61; 0.23≤(R13+R14)/(R13−R14)≤1.21; 0.02≤d13/TTL≤0.07; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.
 10. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies at least one condition of; 4.36≤f8/f≤99.68; and 0.04≤d15/TTL≤0.13; where f8 denotes a focal length of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens. 